Alert archive / Iowa / Severe Thunderstorm Warnings in 1993

Severe Thunderstorm Warning 191, NWS Des Moines, IA

July 31, 1993Marion County, Warren County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jul 31, 1993, 11:12 AM CDT for Marion County, Warren County, Iowa. It was in force for 48 min.

The area

The counties it named.

The facts

Issued
Jul 31, 1993, 11:12 AM CDT (16:12 UTC)
Expired
Jul 31, 1993, 12:00 PM CDT
In force
48 min
Issued by
NWS Des Moines, IA
Area
Whole counties

Counties Marion County, IA, Warren County, IA

The nearest sounding before it

Topeka, KS (KTOP), launched 12:00Z, 4.2 hours before the alert went out and 325 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Topeka, KS at 12:00Z on 1993-07-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2799 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Topeka, KS at 12:00Z on 1993-07-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -4 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
2799 J/kg
Mixed-layer CIN
-188 J/kg
Mixed-layer LCL
1576 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
-4 m²/s²
0-3 km storm-relative helicity
122 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.1

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Jul 31, 10:53 AM CDT, 19 minutes before
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Special weather statement, Jul 31, 10:54 AM CDT, 18 minutes before
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Local storm report, Jul 31, 11:00 AM CDT, 12 minutes before
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Local storm report, Jul 31, 11:01 AM CDT, 11 minutes before
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Special weather statement, Jul 31, 11:07 AM CDT, 5 minutes before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038-
039-040-311715-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WATERLOO IA
1107 AM CDT SAT JUL 31 1993

...THUNDERSTORMS CONTINUE TO RUMBLE THROUGHOUT NORTHEAST AND NORTH
CENTRAL IOWA...

AT 11AM...A LINE OF THUNDERSTORMS PRODUCING VERY HEAVY RAINS...WINDS UP
TO 35 MILES AN HOUR...AND FREQUENT DEADLY LIGHTNING WERE LOCATED FROM 25
MILES SOUTH OF MASON CITY NEAR THE TOWN OF HAMPTON...TO 35 MILES
SOUTHWEST OF WATERLOO NEAR MARSHALLTOWN.  AS THESE STORMS MOVE TO THE
SOUTHEAST AT 25 TO 30 MILES AN HOUR...THEY WILL AFFECT THE TOWNS OF
HAMPTON...PARKERSBURG...WATERLOO...CEDAR FALLS...GRUNDY
CENTER...HUDSON...LA PORTE CITY...AND NEW HARTFORD.

A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 2 PM FOR NORTHEAST AND
NORTH CENTRAL IOWA.  CONDITIONS IN THIS WATCH AREA ARE FAVORABLE FOR
SEVERE THUNDERSTORM DEVELOPMENT AND PERSONS IN THIS AREA SHOULD BE ON
THE LOOKOUT FOR THE POSSIBILITY OF SEVERE STORMS.  CONTINUE TO MONITOR
THE SITUATION THROUGH YOUR LOCAL TELEVISION STATION...RADIO...OR NOAA
WEATHER RADIO FOR FURTHER UPDATES AND POSSIBLE THUNDERSTORM WARNINGS.

LINDENBERG
Special weather statement, Jul 31, 11:08 AM CDT, 4 minutes before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038-
039-040-311715-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WATERLOO IA
1107 AM CDT SAT JUL 31 1993

...THUNDERSTORMS CONTINUE TO RUMBLE THROUGHOUT NORTHEAST AND NORTH
CENTRAL IOWA...

AT 11AM...A LINE OF THUNDERSTORMS PRODUCING VERY HEAVY RAINS...WINDS UP
TO 35 MILES AN HOUR...AND FREQUENT DEADLY LIGHTNING WERE LOCATED FROM 25
MILES SOUTH OF MASON CITY NEAR THE TOWN OF HAMPTON...TO 35 MILES
SOUTHWEST OF WATERLOO NEAR MARSHALLTOWN.  AS THESE STORMS MOVE TO THE
SOUTHEAST AT 25 TO 30 MILES AN HOUR...THEY WILL AFFECT THE TOWNS OF
HAMPTON...PARKERSBURG...WATERLOO...CEDAR FALLS...GRUNDY
CENTER...HUDSON...LA PORTE CITY...AND NEW HARTFORD.

A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 2 PM FOR NORTHEAST AND
NORTH CENTRAL IOWA.  CONDITIONS IN THIS WATCH AREA ARE FAVORABLE FOR
SEVERE THUNDERSTORM DEVELOPMENT AND PERSONS IN THIS AREA SHOULD BE ON
THE LOOKOUT FOR THE| POSSIBILITY OF SEVERE STORMS.  CONTINUE TO MONITOR
THE SITUATION THROUGH YOUR LOCAL TELEVISION STATION...RADIO...OR NOAA
WEATHER RADIO FOR FURTHER UPDATES AND POSSIBLE THUNDERSTORM WARNINGS.

LINDENBERG

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 31, 5:08 AM CDTSevere Thunderstorm WarningDMXBlack Hawk, Bremer52 min
Jul 31, 6:19 AM CDTFlash Flood WarningDMXBenton, Linn56 min
Jul 31, 6:19 AM CDTSevere Thunderstorm WarningDMXBenton, Linn56 min
Jul 31, 7:05 AM CDTSevere Thunderstorm WarningDMXBenton45 min
Jul 31, 7:23 AM CDTFlash Flood WarningDMXBenton3 hr
Jul 31, 7:40 AM CDTSevere Thunderstorm WarningDMXLinn35 min
Jul 31, 8:15 AM CDTSevere Thunderstorm WarningDMXCerro Gordo45 min
Jul 31, 8:25 AM CDTSevere Thunderstorm WarningDMXFranklin65 min
Jul 31, 8:56 AM CDTSevere Thunderstorm WarningDMXHamilton, Hardin34 min
Jul 31, 9:10 AM CDTSevere Thunderstorm WarningDMXChickasaw27 min
Jul 31, 9:19 AM CDTSevere Thunderstorm WarningDMXGreene41 min
Jul 31, 9:30 AM CDTSevere Thunderstorm WarningDMXHamilton, Hardin60 min
Jul 31, 9:51 AM CDTSevere Thunderstorm WarningDMXBoone, Webster44 min
Jul 31, 10:42 AM CDTSevere Thunderstorm WarningDMXStory27 min
Jul 31, 11:02 AM CDTSevere Thunderstorm WarningDMXJasper, Marshall30 min
Jul 31, 11:38 AM CDTSevere Thunderstorm WarningDMXPoweshiek, Tama33 min
Jul 31, 11:52 AM CDTSevere Thunderstorm WarningDMXWright52 min
Jul 31, 12:00 PM CDTSevere Thunderstorm WarningDMXBenton, Iowa30 min
Jul 31, 12:08 PM CDTFlash Flood WarningDMXJohnson, Linn67 min
Jul 31, 12:08 PM CDTSevere Thunderstorm WarningDMXJohnson, Linn67 min
Jul 31, 12:16 PM CDTFlash Flood WarningDMXHardin59 min
Jul 31, 12:16 PM CDTSevere Thunderstorm WarningDMXHardin59 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1993Every severe thunderstorm warning in 1993

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.